Control device for image blur correction

Abstract

A control device for image blur correction, which is applied to an image blur correction device, includes a calculation section and restriction section. The calculation section performs at least read-in operation of reading in outputs from vibration sensors, performs first calculation by using the outputs, and generates a driving control signal for driving the image blur correction device. The calculation section also performs second calculation different from the first calculation. The restriction section permits read-in operation of the output from the vibration sensors but restricts the first calculation when the calculation section performs the second calculation. With this arrangement, when the timing at which the calculation section performs the second calculation overlaps the timing at which the calculation section performs the first calculation, the first calculation is not performed, but the outputs from the vibration sensors is read in. An image blur correction apparatus, optical apparatus, and camera each including the image blur correction device are also disclosed.

What is claimed is:  
     
       1. A control device for image blur correction, which is applied to an image blur correction device, comprising: 
       calculation means for performing at least read-in operation of reading in an output from vibration detection means, performing first calculation by using the output, and generating a driving control signal for driving said image blur correction device, said calculation means also performing second calculation different from the first calculation; and  
       restriction means for permitting read-in operation of the output from said vibration detection means but restricting the first calculation when said calculation means performs the second calculation.  
     
     
       2. A device according to claim  1 , wherein said calculation means comprises means for performing calculation for focus adjustment as the second calculation. 
     
     
       3. A device according to claim  1 , further comprising a memory for storing data corresponding to the output from said vibration detection means. 
     
     
       4. A device according to claim  3 , wherein said memory comprises means for storing the data corresponding to the output from said vibration detection means which is read in when said calculation means performs the second calculation. 
     
     
       5. A device according to claim  4 , wherein said calculation means comprises means for, when the second calculation is not performed, reading out data corresponding to the output from said vibration detection means from said memory and performing the first calculation using the readout data. 
     
     
       6. A device according to claim  1 , wherein said calculation means comprises means for performing high-pass filter calculation as the first calculation. 
     
     
       7. A device according to claim  1 , wherein said calculation means comprises means for performing integration calculation as the first calculation. 
     
     
       8. A device according to claim  1 , wherein said calculation means comprises means for performing digital filter calculation as the first calculation. 
     
     
       9. A device according to claim  1 , wherein said image blur correction control device performs PWM driving control on said image blur correction device. 
     
     
       10. A device according to claim  9 , wherein said calculation means comprises means for performing digital filter calculation as the first calculation. 
     
     
       11. A device according to claim  1 , wherein said image blur correction device performs image blur correction operation in a first direction and a second direction different from the first direction, and 
       said calculation means comprises means for performing, as the first calculation, (1) calculation for generating a driving control signal for image blur correction in the first direction, and (2) calculation for generating a driving control signal for image blur correction in the second direction.  
     
     
       12. A device according to claim  11 , wherein said restriction means comprises means for imposing the restriction on one of (1) the calculation for generating a driving control signal for image blur correction in the first direction and (2) the calculation for generating a driving control signal for image blur correction in the second direction, and imposing no restriction on the other. 
     
     
       13. A device according to claim  12 , wherein said restriction means comprises means for determining one of directions of (1) the calculation for generating a driving control signal for image blur correction in the first direction and (2) the calculation for generating a driving control signal for image blur correction in the second direction, and to impose the restriction on a determined direction on the basis of a posture of a device to which said image blur correction device is applied. 
     
     
       14. A device according to claim  11 , wherein said restriction means comprises means for determining at least one of (1) the calculation for generating a driving control signal for image blur correction in the first direction and (2) the calculation for generating a driving control signal for image blur correction in the second direction, and to impose the restriction on determined calculation on the basis of a posture of a device to which said image blur correction device is applied. 
     
     
       15. A device according to claim  1 , wherein said calculation means comprises means for performing the first calculation in predetermined cycles. 
     
     
       16. A device according to claim  1 , wherein said image blur correction device comprises means for optically correcting an image blur. 
     
     
       17. A device according to claim  1 , wherein said image blur correction device comprises means for optically correcting an image blur by being displaced in an optical path. 
     
     
       18. An image blur correction apparatus comprising: 
       an image blur correction device;  
       calculation means for performing at least read-in operation of reading in an output from vibration detection means, performing first calculation by using the output, and generating a driving control signal for driving said image blur correction device, said calculation means also performing second calculation different from the first calculation; and  
       restriction means for permitting read-in operation of the output from said vibration detection means but restricting the first calculation when said calculation means performs the second calculation.  
     
     
       19. An optical apparatus comprising: 
       an image blur correction device;  
       calculation means for performing at least read-in operation of reading in an output from vibration detection means, performing first calculation by using the output, and generating a driving control signal for driving said image blur correction device, said calculation means also performing second calculation different from the first calculation; and  
       restriction means for permitting read-in operation of the output from said vibration detection means but restricting the first calculation when said calculation means performs the second calculation.  
     
     
       20. A camera comprising: 
       an image blur correction device;  
       calculation means for performing at least read-in operation of reading in an output from vibration detection means, performing first calculation by using the output, and generating a driving control signal for driving said image blur correction device, said calculation means also performing second calculation different from the first calculation; and  
       restriction means for permitting read-in operation of the output from said vibration detection means but restricting the first calculation when said calculation means performs the second calculation.